Well... you'll prolly not have to fab up very much, at least concerning the rear wheel. If you've budget considerations the least inexpensive route would be to scrounge up a used mountain bike and just rob it's rear wheel, derailleur & shifter (mebbe front too sos they'll match) - usually it's simply a "bolt n'go" with the only tricky bits being you may need to spread the rear stays a hair & the derailleur mount. Most will simply slip behind the axle nut regardless of if the bike was designed for it or not, but you may need to drill a small hole in the dropout to put in a retaining bolt...
While I tend to buy hubs & rims and have them built - w/a ballpark (minimum) cost of $30 rim, $35 hub, $40 build = a lil over a $100 a wheel, this isn't necessarily the best choice if you're after a commonly available wheel, which you seem to be. While ya can jus' shop around for a 26" mountain bike w/disk brake wheel - I would
very much recommend going to your local bike shop and ask if they've any "take offs" as a LOT of folks immediately upgrade their new bike even before it leaves the shop, resulting in heaps of brand new wheels and brakes, derailleurs & shifters all at sometimes massively reduced costs.
As the wheel yer after is so fortunately commonplace, I can't really give ya a quick easy link as there's
hundreds if not thousands of places lol, but that's a good thing
